Assuming the two aren't coordinating... Facebook was founded the day they shut down DARPA's LifeLog project,
LifeLog aimed to compile a massive electronic
database of every activity and relationship a person engages in. This was to include credit card purchases, web sites visited, the content of telephone calls and e-mails sent and received, scans of faxes and postal mail sent and received, instant messages sent and received, books and magazines read, television and radio selections, physical location recorded via wearable GPS sensors, biomedical data captured through wearable sensors. The high level goal of this data logging was to identify "preferences, plans, goals, and other markers of intentionality".
en.wikipedia.org